KR20040050875A - Heat exchanger - Google Patents

Abstract

PURPOSE: A heat exchanger is provided to reduce the cost for manufacturing a heat exchanger by fixing a pipe at a fin-attached tube without soldering and by securing thermal contact between the pipe and the fin-attached tube, and improve the heat exchange performance. CONSTITUTION: A heat exchanger includes a fin-attached tube having fins(22) on an outer periphery of a circular pipe(21), and a pipe(24) arranged on an outer circumference of the fin-attached tube, wherein heat exchange is made between a first fluid flowing in the fin-attached tube and a second fluid flowing in the pipe. The fins are bent to fix the pipe at the outer circumference of the fin-attached tube.

Description

Heat exchanger {HEAT EXCHANGER}

The present invention relates to a heat exchanger used in a refrigeration cycle device, and more particularly, to a heat exchanger used as a heat exchanger for hot water supply in a hot water supply device.

For example, as the use-side heat exchanger 2 used in the refrigeration cycle apparatus, as shown in Fig. 12, the pipe 11 and the pipe 12 wound spirally around the outer periphery of the pipe 11, The heat exchanger which used the inside of the pipe 11 as the flow path of a 1st fluid (for example, water), and used the inside of the pipe 12 as the flow path of a 2nd fluid (for example, refrigerant) is employ | adopted. (For example, refer patent document 1).

[Patent Document 1]

Japanese Patent Laid-Open No. 2001-280862 (page 6-7, Fig. 5)

By the way, in the heat exchanger comprised by spirally winding the pipe 12 around the outer periphery of the pipe 11 as shown in FIG. 12, in order to ensure thermal contact of the pipe 11 and the pipe 12, the furnace ( Iii) It is necessary to join the pipe 11 and the pipe 12 by soldering. For this reason, an expensive soldering furnace is required, and the problem that a heat exchanger becomes expensive in order to collect the equipment investment has arisen.

Therefore, an object of the present invention is to achieve both high performance and low cost of a heat exchanger by ensuring thermal contact between the pipe 11 and the pipe 12 without soldering in the furnace.

1 is a block diagram showing a hot water supply apparatus using a heat exchanger of the present invention,

Figure 2 is an appearance perspective view of the main part of the finned tube flowing the first fluid of the heat exchanger according to an embodiment of the present invention,

3 is an external perspective view showing a main part of a state in which a part of a pipe through which a second fluid flows is disposed in an outer circumference of a pinned tube according to the embodiment;

4 is a cross-sectional view of an essential part showing a state in which a pipe is disposed at an outer circumference of a pinned tube according to the embodiment;

5 is a sectional view of principal parts showing a completed state according to the embodiment;

6 is a sectional view of an essential part of a heat exchanger according to another embodiment;

7 is a sectional view of an essential part of a heat exchanger according to another embodiment;

8 is a sectional view of an essential part of a heat exchanger according to another embodiment;

9 is an external perspective view illustrating a main part of a finned tube in which a first fluid flows in a heat exchanger according to another embodiment;

Fig. 10 is an external perspective view showing the main part showing a state in which a pipe through which a second fluid flows is arranged in an outer circumference of a finned tube of the heat exchanger;

11 is a cross-sectional view showing a state in which a pipe is disposed on an outer circumference of a finned tube of the heat exchanger;

12 is an external perspective view of an essential part showing a conventional heat exchanger.

<Explanation of symbols for the main parts of the drawings>

1: Compressor 2: Heat Exchanger on Use Side (Heat Exchanger)

3: pressure reducer 4: heat source side heat exchanger (outdoor heat exchanger)

5: water feed pump 6: hot water tank

11, 12, 24, 34, 35, 44, 54: pipe

20, 31, 41, 50: pinned tube 22, 32, 42, 52: pin

The heat exchanger of the present invention according to claim 1 is composed of a finned tube having fins on an outer circumference of the tube, a pipe disposed on an outer circumference of the finned tube, and a first fluid flowing inside the finned tube and the A heat exchanger for performing heat exchange between second fluids flowing inside a pipe, wherein the pipe is bent to fix the pipe to an outer circumference of the pinned pipe.

The heat exchanger of the present invention according to claim 2 comprises a finned tube having fins on an outer circumference of the tube, a pipe disposed on an outer circumference of the finned tube, and a first fluid flowing inside the finned tube and the A heat exchanger for performing heat exchange between a second fluid flowing inside a pipe, wherein the pipe is disposed in a space between the fins, and the pipe is brought into contact with the fin surface located at least on both sides and the pipe. .

This invention of Claim 3 WHEREIN: The heat exchanger of Claim 1 or 2 WHEREIN: The said pipe was wound in the said spirally attached pipe | tube with the said pin.

This invention of Claim 4 WHEREIN: The heat exchanger of Claim 1 or 2 WHEREIN: The said pipe was arrange | positioned in parallel with the tube axis of the said pinned tube. It is characterized by the above-mentioned.

This invention of Claim 5 made the inside diameter of the said pipe smaller than the inside diameter of the said finned tube in the heat exchanger of Claim 1 or Claim 2 characterized by the above-mentioned.

The invention according to claim 6 is characterized in that, in the heat exchanger according to claim 1 or 2, the second fluid is a fluid having a higher operating pressure than the first fluid.

This invention of Claim 7 made the said 2nd fluid into carbon dioxide gas, and said 1st fluid into water in the heat exchanger of Claim 1 or 2 characterized by the above-mentioned.

This invention of Claim 8 filled the heat transfer material in the space formed between the said pipe, the said fin, and the said pipe | tube in the heat exchanger of Claim 1 or 2 characterized by the above-mentioned.

In the heat exchanger according to claim 1 or 2, the heat exchanger according to claim 9 has a plurality of pipes arranged on the outer circumference of the finned tube, and the passage of the second fluid is multipassed. It is done.

Embodiment of the Invention

According to the first embodiment of the present invention, the pipe is bent to the outer circumference of the pinned tube by bending the pin. According to this embodiment, since soldering is unnecessary and thermal contact between a finned tube and a pipe can be ensured, the manufacturing cost of a heat exchanger can be reduced, and heat exchange is made by increasing the contact area of a finned tube and a pipe. Improves performance.

Moreover, the 2nd Embodiment which concerns on this invention arrange | positions a pipe in the space between fins, and makes a pipe contact with the fin surface and a pipe located in at least both sides. According to this embodiment, heat exchange performance improves by the contact area increase of a pinned tube and a pipe.

In the third embodiment according to the present invention, in the first or second embodiment, the pipe is spirally wound around the pinned pipe. According to this embodiment, heat exchange performance improves by the contact area increase of a pinned tube and a pipe.

Moreover, in 4th Embodiment which concerns on this invention, in a 1st or 2nd Embodiment, a pipe is arrange | positioned and arranged in parallel with respect to a pipe with a fin. According to the present embodiment, the heat exchange performance is improved by increasing the contact area between the pinned tube and the pipe, and the passage is easy to be multipassed.

Moreover, in 5th Embodiment which concerns on this invention, in 1st or 2nd Embodiment, the inside diameter of a pipe is made smaller than the inside diameter of a pinned pipe. According to this embodiment, since a pipe with a small diameter is easy to process, it is easy to arrange | position a pipe in the outer periphery of a pipe with a pin.

Further, in the sixth embodiment according to the present invention, in the first or second embodiment, the operating pressure of the second fluid flowing through the inside of the pipe is higher than the operating pressure of the first fluid flowing through the inside of the pinned tube. It is made up. According to this embodiment, the cost which improves the internal pressure of a heat exchanger can be reduced by making a high pressure 2nd fluid flow inside the small diameter pipe which is easy to ensure internal pressure.

Further, in the seventh embodiment according to the present invention, in the first or second embodiment, the second fluid flowing through the inside of the pipe is carbon dioxide gas, and the first fluid flowing through the inside of the fin attachment pipe is used as water. Qi. According to the present embodiment, the heat transfer characteristics are good and the carbon dioxide gas having a high pressure flows inside the small-diameter pipe which can easily secure the internal pressure, thereby reducing the cost of improving the pressure resistance of the heat exchanger, and improving the heat exchange performance. Improve.

In the heat exchanger according to the eighth embodiment of the present invention, in the first or second embodiment, the heat transfer material is filled in the space formed between the outer circumferential surface of the fin attachment pipe and the fin and the pipe. According to this embodiment, more reliable thermal contact can be obtained and heat exchange performance improves.

In the heat exchanger according to the ninth embodiment of the present invention, in the first or second embodiment, a plurality of pipes are arranged on the outer circumference of the finned tube, and the flow path of the second fluid flowing inside the pipe is provided. It is a multi-pass heat exchanger. According to this embodiment, the pressure loss of a 2nd fluid can be reduced and heat exchange performance improves.

EXAMPLE

First, the refrigeration cycle apparatus using the heat exchanger of this invention is demonstrated. 1 is a block diagram showing a hot water supply apparatus using a heat exchanger of the present invention.

As shown in Fig. 1, the hot water supply apparatus according to the present embodiment includes a compressor 1, a heat exchanger side for use as a heat exchanger for a hot water supply, a pressure reducer 3, and a heat source side heat exchanger having external air as a heat source ( The refrigerant | coolant cycle A which consists of 4), and the hot water supply cycle B which consists of the feed water pump 5, the utilization side heat exchanger 2, and the hot water supply tank 6 are provided. The refrigerant cycle A uses, for example, carbon dioxide (carbon dioxide) as the refrigerant, and the compressor 1 operates by compressing the refrigerant to a pressure above the critical pressure.

The refrigerant discharged from the compressor 1 heats the water supplied from the feed water pump 5 in the use-side heat exchanger 2, and the heated boiling water is stored in the hot water supply tank 6.

Next, a configuration of a heat exchanger according to an embodiment of the present invention used for such a hot water supply device will be described with reference to FIGS. 2 to 5.

2 to 5 show a manufacturing process of the heat exchanger according to the present embodiment, FIG. 2 is an external perspective view of a main portion of the finned tube through which the first fluid flows, and FIG. 3 shows a second fluid flowing through the outer circumference of the finned tube. Main part appearance perspective view which shows the state which arrange | positioned a part of pipe, FIG. 4 is sectional drawing of the principal part which shows the state which arrange | positioned the pipe in the outer periphery of a pinned tube, and FIG.

As shown in FIG. 2, the finned tube 20 generally called the low fin tube or the high fin tube is formed in the outer periphery of the cylindrical tube 21, and the fin 22 of predetermined height is formed in spiral shape. Between the pins 22 formed at substantially equal intervals, a spiral space 23 is formed.

As shown in FIG. 3, the pipe 24 is wound spirally in the space 23 between the pins 22 of the pinned tube 20. As shown in FIG. 4, the pipe 24 is wound around the pinned tube 20, and the outer peripheral surface of the pipe 24 is located on both sides of the outer peripheral surface of the tube 21 and the pin 22. It consists of outer diameter to make contact with the surface.

After winding the pipe 24 to the finned tube 20, as shown in FIG. 5, the heat exchanger 2a is produced by bending a part of the fin 22 of the finned tube 20. As shown in FIG. The pin 22 is bent into a hollow jig or extruded or drawn out. By bending the pin 22 so as to surround the pipe 24 and fixing the pipe 24 to the outer circumference of the pinned tube 20 by the bending piece of the pin 22, the pipe 24 and the pinned tube ( Ensure thermal contact in 20).

In the heat exchanger 2a according to the present embodiment, the inside of the finned tube 20 is a flow path of a first fluid such as water, for example, and the inside of the pipe 24 is, for example, carbon dioxide gas. It is set as the flow path of the 2nd fluid which is a refrigerant. On the other hand, it is preferable to make a 1st fluid and a 2nd fluid opposing flow.

In the heat exchanger 2a comprised as mentioned above, the following effects can be acquired.

First, since the thermal contact between the finned tube 20 and the pipe 24 can be ensured without soldering in a furnace like a conventional heat exchanger, the manufacturing cost of the heat exchanger 2a can be reduced. Can be. In the conventional heat exchanger, the metal 12 is in contact with the pipe 12 only by the outer circumference of the pipe 11, whereas in the heat exchanger 2a of the present embodiment, the pipes 22 are surrounded by the fins 22. Since it is fixed, the metal contact surface increases, and the thermal contact of the pinned pipe 20 and the pipe 24 can be obtained more reliably, and heat exchange performance improves.

In addition, the inside of the pipe 24 is used as a flow path for the second fluid having a higher operating pressure than the first fluid, and the inside of the pinned tube 20 is a flow path for the first fluid having a lower operating pressure than the second fluid. Therefore, since the pipe 24 through which the second fluid having a high operating pressure flows is a small diameter pipe that is easy to ensure internal pressure, the increase in the raw material cost due to the increase in the thickness required to secure the internal pressure of the pipe 24 is greatly increased. It can suppress and the cost which improves the internal pressure improvement of the heat exchanger 2a can be reduced.

Next, the operation | movement in the case of using the heat exchanger 2a comprised as mentioned above for a hot water supply apparatus is demonstrated.

The inside of the pipe 24 is a flow path of carbon dioxide gas which is a refrigerant | coolant, and the inside of the pinned tube 20 is a flow path of water. In this hot water supply apparatus, the refrigerant compressed by the compressor 1 is in a high temperature and high pressure state, and when the pipe 24 of the use side heat exchanger 2a, which is the heat exchanger of the present embodiment, passes through the pipe 24, It cools by radiating heat inside the flowing water. That is, the water sent from the bottom of the hot water tank 6 to the inside of the pinned tube 20 by the feed water pump 5 is heated by the refrigerant flowing through the inside of the pipe 24. The coolant is then depressurized by the pressure reducer 3 to be in a gas-liquid abnormal state of low temperature and low pressure. In the heat source-side heat exchanger 4, the refrigerant is cooled by air to be in a gas-liquid or gaseous state, and the refrigerant in a gas-liquid or gaseous state is again sucked into the compressor 1. By repeating this cycle, the water flowing inside the finned tube 20 of the use-side heat exchanger 2a becomes boiling water and can be used as a hot water heater by storing the boiling water in the head of the hot water tank 6. have. As described above, when the heat exchanger 2a of the present embodiment is used as the utilization side heat exchanger of the hot water supply device using the carbon dioxide gas as the refrigerant, the pipe having a smaller diameter can easily hold the carbon dioxide gas having a higher operating pressure than other refrigerants. It is possible to flow into the inside of (24), to reduce the cost of improving the internal pressure of the heat exchanger 2a, and to improve the heat exchange performance by flowing carbon dioxide gas having good heat transfer characteristics.

Next, the structure of the heat exchanger which concerns on another Example is demonstrated using FIG.

In addition to the configuration of the heat exchanger shown in FIG. 5, the heat exchanger 2b according to the present embodiment is heat-transmitting in the gap 25 formed by the bent fin 22 and the outer circumferential surface of the pipe 24. A member made of this high substance, for example, a paste containing powder of an aluminum alloy, is filled. In such a heat exchanger 2b, the heat resistance of the gap 25 is reduced by a material having high thermal conductivity, so that more reliable thermal contact can be obtained, so that the heat exchange performance is improved.

In addition, the structure of the heat exchanger which concerns on another Example is demonstrated using FIG. In the heat exchanger 2c according to the present embodiment, two pipes 34 and 35 are wound in a spiral shape between a plurality of fins 32 of the fin attachment pipe 31, and a part of the fins 32 is wound. By bending, the pipes 34 and 35 and the pinned tube 31 are fixed. Further, the pipe 34 and the pipe 35 branch the flow path of the second fluid by branch pipes (not shown), so that the second fluid parallels the inside of each of the pipe 34 and the pipe 35. It is comprised so that it may flow, ie, two passes of the flow path of a 2nd fluid. In such a heat exchanger 2c, the pressure loss of the second fluid can be reduced, and the heat exchange performance is further improved. On the other hand, in the present embodiment, a configuration in which two pipes are wound and the flow path of the second fluid is made into two passes is described. However, a plurality of pipes are wound so that the flow path of the second fluid is further increased. You may pass.

In addition, the structure of the heat exchanger which concerns on another Example is demonstrated using FIG. The heat exchanger 2d according to the present embodiment is not so high that the fin 42 of the finned tube 41 bends and fixes the pipe 44. In such a heat exchanger 2d, the pipe 44 cannot be fixed by the fins 42. However, since the height of the fins 42 is low, the production of the finned tube 41 becomes relatively easy, and thus the production cost is increased. Can be reduced. Furthermore, by making the fins 42 into the shape of the mountains so as to fill the gaps between the adjacent pipes 44, the area where the fin-attached pipes 41 and the pipes 44 are in metal contact increases, thereby improving heat exchange performance. .

On the other hand, in the heat exchanger described above, the fins 22, 32, 42 of the finned tubes 20, 31, 41 are made of the same material as the finned tubes, for example, by a processing method such as rolling. It is preferable that it is formed integrally with aluminum alloy or copper which has high thermal conductivity. In addition, a spiral groove, a colgate, or the like may be formed inside the finned pipes 20, 31, and 41 to increase the heat transfer area and promote turbulence, thereby further improving the performance of the heat exchanger.

In addition, the structure of the heat exchanger which concerns on another Example is demonstrated using FIGS. 9-11.

Fig. 9 is a perspective view of an essential part of a finned tube through which the first fluid flows in the heat exchanger according to the present embodiment. Fig. 10 shows a state in which a pipe in which a second fluid flows is arranged in the outer circumference of the finned tube of the same heat exchanger. 11 is a cross-sectional view showing a state in which a pipe is disposed on an outer circumference of a pinned tube.

As shown in FIG. 9, the pinned pipe | tube 50 is formed in the outer periphery of the tubular pipe 51, and several pin 52 of predetermined height is formed in parallel in the tube-axis direction. In the heat exchanger 2e of the present embodiment, as shown in FIGS. 10 and 11, the pipe 54 is parallel to the tube axis of the finned tube 50 in the space 53 between the plurality of fins 52. To place it. Thereafter, as shown in FIG. 11, the pipe 54 is wrapped by the pin 52 of the pinned tube 50 by bending or cutting, or the bent end is bent so as to fit the pipe. (54) is fixed to the outer periphery of the pinned tube 50, and the thermal contact of the pipe 54 and the pinned tube 50 is ensured. In such a heat exchanger 2e, in addition to having the same effect as the heat exchanger 2a having the configuration shown in FIG. 4, the point 54 and the fin (where the height of the fin 52 is relatively low) can be fixed. Due to the relatively easy extrusion and drawing process for bending 52), the manufacturing cost can be reduced. In addition, there is also an advantage that it is possible to easily multiply the second fluid passage as described in the heat exchanger 2c having the configuration shown in FIG. 7.

In addition, the pin 52 of the pinned tube 50 is preferably formed integrally with the same material as the pinned tube, for example, aluminum alloy or copper having high thermal conductivity, by a processing method such as extrusion. .

According to the present invention, by fixing the pipe to the outer circumference of the bent fin tube, the soldering is unnecessary and the thermal contact between the fin tube and the pipe can be ensured, thereby reducing the manufacturing cost of the heat exchanger. In addition, heat exchange performance is improved by increasing the contact area between the finned pipe and the pipe.

Further, according to the present invention, the heat exchange performance is improved by increasing the contact area between the finned tube and the pipe by bringing the pipe into contact with the fin surface and the pipe located at least on both sides.

Further, according to the present invention, the pipe is spirally wound around the finned tube, whereby the heat exchange performance is improved by increasing the contact area between the finned tube and the pipe.

According to the present invention, by arranging the pipes in parallel with the finned pipes, the heat exchange performance is improved due to the increase in the contact area between the finned pipes and the pipes, and the flow path is easily multiplied.

Moreover, according to this invention, since the inside diameter of a pipe is made smaller than the inside diameter of a pinned pipe, it is easy to process a pipe with a small diameter, and it is easy to arrange a pipe in the outer periphery of a pinned pipe.

Moreover, according to this invention, the cost which improves the internal pressure of a heat exchanger can be reduced by making a high pressure 2nd fluid flow inside the small diameter pipe which is easy to ensure internal pressure.

In addition, according to the present invention, the cost of improving the pressure resistance of the heat exchanger can be reduced by allowing carbon dioxide gas having good heat transfer characteristics and high pressure to flow inside the small-diameter pipe which can easily secure the internal pressure, and thus the heat exchange performance. This improves.

Further, according to the present invention, by filling the heat transfer material in the outer circumferential surface of the finned tube and the space formed between the fin and the pipe, more reliable thermal contact can be obtained, and the heat exchange performance is improved.

According to the present invention, the pressure loss of the second fluid can be reduced by using a plurality of pipes arranged on the outer circumference of the pinned pipe and multiplying the passage of the second fluid flowing through the inside of the pipe. Can improve the heat exchange performance.

Claims (9)

A fin attachment pipe having a fin at an outer circumference of the tube, and a pipe disposed at an outer circumference of the fin attachment pipe, the first fluid flowing through the inside of the pin attachment pipe and a second fluid flowing through the inside of the pipe; A heat exchanger for performing heat exchange between the heat exchangers, wherein the fins are bent to fix the pipe to an outer circumference of the fin attachment pipe. A fin attachment pipe having a fin at an outer circumference of the tube, and a pipe disposed at an outer circumference of the fin attachment pipe, the first fluid flowing through the inside of the fin attachment pipe and a second fluid flowing through the inside of the pipe; A heat exchanger for performing heat exchange between the heat exchangers, wherein the pipe is disposed in the space between the fins, and the pipe is brought into contact with the fin surface located at least on both sides of the pipe. The heat exchanger according to claim 1 or 2, wherein the pipe is spirally wound around the finned tube. The heat exchanger according to claim 1 or 2, wherein the pipe is disposed in parallel with the tube axis of the finned tube. The heat exchanger according to claim 1 or 2, wherein the inner diameter of said pipe is made smaller than the inner diameter of said finned tube. The heat exchanger according to claim 1 or 2, wherein the second fluid is a fluid having an operating pressure higher than that of the first fluid. The heat exchanger according to claim 1 or 2, wherein the second fluid is made of carbon dioxide and the first fluid is made of water. The heat exchanger according to claim 1 or 2, wherein a heat transfer material is filled in a space formed between the pipe, the fin, and the pipe. The heat exchanger according to claim 1 or 2, wherein a plurality of pipes arranged on an outer circumference of the finned tube are provided in plural, and the passage of the second fluid is made into multiple passes.